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    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .top {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-around;
        }

        .top .right {
            display: flex;
            justify-content: space-around;
        }

        .top .right>div {
            width: 49%;
        }

        .top>div {
            width: 49%;
        }

        .top img {
            width: 100%;
        }

        @media screen and (max-width:768px) {
            .top>div {
                width: 100%;
            }
        }

        .bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-around;
        }

        .bottom>div {
            width: 23%;
            padding: 5px;
            box-sizing: border-box;
            border: 1px solid gray;

            margin-bottom: 10px;
            box-shadow: 0 0 5px black;
        }

        .bottom img {
            width: 100%;
        }

        @media screen and (min-width:768px) and (max-width:1024px) {
            .bottom>div {
                width: 31%;
            }
        }
        @media screen and (min-width:450px) and (max-width:768px) {
            .bottom>div {
                width: 48%;
            }
        }
        @media screen and (max-width:450px) {
            .bottom>div {
                width: 90%;
            }
        }
    </style>
</head>

<body>

    <!-- top: flex, wrap,
                    >768px 左49% 右49%
                    768px  上 100% 下100%
                    bottom: flex, wrap
                    >1024  23%*4
                    768< <1024 31%*3
                    450< <768 48%*2
                    <450 90%*1 -->

    <div class="top">
        <div class="left"><img src="../图片/练习1.png" alt=""></div>
        <div class="right">
            <div><img src="../图片/练习2.png" alt=""></div>
            <div><img src="../图片/练习3.png" alt=""></div>
        </div>
    </div>
    <div class="bottom">
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
        <div><img src="../图片/练习4.png" alt="">
            <p>迷你微型摄影展</p>
        </div>
    </div>
</body>

</html>